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Timing a ' 54 Tiger using a Lucas K2F Magneto #78267
03/29/05 4:44 pm
03/29/05 4:44 pm
Joined: Aug 2001
Posts: 6,892
Vermont
Jon W. Whitley Online content OP

BritBike Forum member
Jon W. Whitley  Online Content OP

BritBike Forum member
Joined: Aug 2001
Posts: 6,892
Vermont
Okay,

On my '54 Tiger 100,I had to change out magneto's and even though I have the factory shop manual,the Clymer manual from 1951, and the Hayne's manual, it is still a little vague, and required a bit of thinking to finally believe I knew what they were talking about.

The one thing I have trouble with, is keeping the mag armature from moving and or turning as I slip the automatic advance unit (set in the advanced position using a wedge) on to the magneto shaft.That think turns if you blow on it hard enough!

Anybody got any insight into this, that they can share with me, or put the procedure down in their own words.I think I got it pretty close, as I did get the bike to fire up, and except for the carbs being gummed up, Igot it to run long enough to start responding to the throttle.Sounded good anyway!!! beerchug


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

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Re: Timing a ' 54 Tiger using a Lucas K2F Magneto #78268
03/29/05 9:08 pm
03/29/05 9:08 pm
Joined: Aug 2001
Posts: 96
Northern Virginia / USA
B
Brent Pinkstaff Offline
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Brent Pinkstaff  Offline
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Joined: Aug 2001
Posts: 96
Northern Virginia / USA
Jon,

I would image that you can grab the points cam with a pair of needle nose or similar to hold the mag in place while you slide the drive assembly onto the shaft. You might need a helper if you can't hold the advance unit in the full advance position with one hand. I have always had the good fortune of a well behaved mag (stays where I want it when I time it).

Make sure that you time one side, check the other side and even out the difference. I don't think any of the manuals call for you to do that, but the Lucas mags are usually off a few degrees. You are better off with both cyl firing at the same point than having one at the factory spec and the other not.

Hope this helps,


Brent Pinkstaff - Falls Church, VA
'38 5T
'46 T100
'48 5T
'50 TR5
'50 6T
'58 TR6/A
'59 T120
Re: Timing a ' 54 Tiger using a Lucas K2F Magneto #78269
03/29/05 9:23 pm
03/29/05 9:23 pm
Joined: Oct 2003
Posts: 11,168
North Georgia, USA
RF Whatley Offline
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RF Whatley  Offline
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Joined: Oct 2003
Posts: 11,168
North Georgia, USA
Jon -
Not to worry... you are now experiencing "true Brit". The timing on all mags slips a bit when setting them up. Set your timing wheel where you know it's dead on, and chock the advance unit.

When the degree wheel is "on" and the buzz box is telling you the armature is "on" you can place a socket large enough to step over the AA center bolt and give the gear a slight tap onto the taper, then tighten the center bolt.

You'll see you're high or low, then you have to adjust your proceedure from there. I've hardly ever seen a mag timed in less than 3 tries.

PS. The old books said to use cigarette paper in the points, but you go ahead an use a modern "buzz box", OK?

Hope this helps. bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
Re: Timing a ' 54 Tiger using a Lucas K2F Magneto #78270
03/30/05 3:09 am
03/30/05 3:09 am
Joined: Aug 2001
Posts: 6,892
Vermont
Jon W. Whitley Online content OP

BritBike Forum member
Jon W. Whitley  Online Content OP

BritBike Forum member
Joined: Aug 2001
Posts: 6,892
Vermont
Brent and RedNeck,

I appreciate the help. Now I've been riding Triumph's for 18 years (since I was 18!!!)and RedNeck, I've never heard of a buzz box ?!!! Now,I have to admit that they were all unit twins, and I've just recently got to the point of having running Pre-Units, so please let me know what this is, and I'll make sure to go get one.Also,the bike only has a magneto and no other electrics right now, since it was set up for flat tracking, I guess ? Anyway, I'll be wiring it for street riding of course.

Brent,one of my manuals does mention that you need to time both sides,it may be the Clymer manual, I'll take a look, and it may be the Haynes believe it or not ?!!! :stout: :stout: :stout:


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Timing a ' 54 Tiger using a Lucas K2F Magneto #78271
03/30/05 10:34 am
03/30/05 10:34 am
Joined: Aug 2001
Posts: 7,310
scotland
triton thrasher Online content
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triton thrasher  Online Content
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Joined: Aug 2001
Posts: 7,310
scotland
It helps if the tapers on shaft and pinion are in good shape. They may benefit from grinding-in to each other with valve paste.

I just press the pinion on hard with my thumbs, then tighten up. Use a washer under the nut


Amateur Loctite enthusiast.
Re: Timing a ' 54 Tiger using a Lucas K2F Magneto #78272
03/30/05 12:41 pm
03/30/05 12:41 pm
Joined: Aug 2001
Posts: 96
Northern Virginia / USA
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Brent Pinkstaff Offline
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Brent Pinkstaff  Offline
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Joined: Aug 2001
Posts: 96
Northern Virginia / USA
Jon,

The 'Buzz Box' that RedNeck is talking about is a resistance tester? My buddy that owns one of the local shops here has one. Basically you use it just like a voltage meter, but when you get a connection it makes a buzzing sound. Neat piece, and is very useful for finding shorted out points, etc. I don't have one, so I use the cigarette wrapper method for timing the mags. Getting harder to come by for me, since I quit smoking almost 10 years ago!

Didn't realize that the aftermarket manuals had that info. I'm pretty sure that Triumph manuals don't have that info, but I could be wrong. I do know that the method for timing the mag in the factory manuals is not the best way (measured drop of the piston) as most of the bikes have domed pistons. Degree wheel is definately the way to go.


Brent Pinkstaff - Falls Church, VA
'38 5T
'46 T100
'48 5T
'50 TR5
'50 6T
'58 TR6/A
'59 T120
Re: Timing a ' 54 Tiger using a Lucas K2F Magneto #78273
03/30/05 2:25 pm
03/30/05 2:25 pm
Joined: Jan 2003
Posts: 554
west central ohio where all be...
D
drp Offline
BritBike Forum member
drp  Offline
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D
Joined: Jan 2003
Posts: 554
west central ohio where all be...
Many of the VOM (volt ohm meters) have a feature that will buzz when you have a dead short. If you attach one lead to your point plate and one to the movable contact, set it on the proper position then the meter will "buzz" when the points make contact. The other option is to buy one of those cheap continuity testers (harbor freight or sears) put an alligator clip on the point, attach on lead to the point plate and the other to the movable contact and look for the light when the contact closes.

Dave

Re: Timing a ' 54 Tiger using a Lucas K2F Magneto #78274
03/31/05 10:46 am
03/31/05 10:46 am
Joined: Aug 2001
Posts: 7,310
scotland
triton thrasher Online content
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triton thrasher  Online Content
BritBike Forum member
Joined: Aug 2001
Posts: 7,310
scotland
Quote:
Originally posted by triton thrasher:
Use a washer under the nut
That was stupid. You can't use a washer with a Lucas auto-advance.


Amateur Loctite enthusiast.
Re: Timing a ' 54 Tiger using a Lucas K2F Magneto #78275
03/31/05 2:36 pm
03/31/05 2:36 pm
Joined: Aug 2001
Posts: 6,892
Vermont
Jon W. Whitley Online content OP

BritBike Forum member
Jon W. Whitley  Online Content OP

BritBike Forum member
Joined: Aug 2001
Posts: 6,892
Vermont
triton thrasher,

Actually,the advance does have the U-Clip washer that acts as a washer, so you're not far off.That was a subject of a previous post, to which I've obtained two since then. :stout: :stout:


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project


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